My bad, I forgot the ball joint is in the steering knuckle, not in the lower control arm.
And I looked up the steering knuckle (PN's: 52088652AE & 52088653AE {L&R}) and none of them come with the ball joint already installed.
So your options are to purchase new ball joints and press out the old ones and press in the new ones with the press tools.
or
Purchase new steering knuckles (L&R) and install new ball joints in them and reinstall them in your Jeep.
This eliminates the need to have to press the old rusty ones out of your current knuckles.
But this would also require removing your old hub bearings to install in the new steering knuckles.
**Some advise on pressing the old ones out: Soak them in some very good deep penetrating oil like Kroil for a few days if you can before attempting the press out of the old ball joints. Another tip is to heat the area around the knuckle where the ball joint is located with a hand torch right before you start applying pressure to the old ball joint to help expand the metal around the ball joint.
As to the tools, whatever you choose, it must a heavy duty to be able to apply the necessary force without bending during the press out/in of the ball joint.

Good luck and keep us posted!

_________________
Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve